Chore: use unified "gates" for ci tests and docs checks (#12277)

.github/workflows/ci-backend.yml

@@ -3,21 +3,9 @@ on:
   push:
     branches-ignore:
       - 'translations**'
-    paths:
-      - 'src/**'
-      - 'pyproject.toml'
-      - 'uv.lock'
-      - 'docker/compose/docker-compose.ci-test.yml'
-      - '.github/workflows/ci-backend.yml'
   pull_request:
     branches-ignore:
       - 'translations**'
-    paths:
-      - 'src/**'
-      - 'pyproject.toml'
-      - 'uv.lock'
-      - 'docker/compose/docker-compose.ci-test.yml'
-      - '.github/workflows/ci-backend.yml'
   workflow_dispatch:
 concurrency:
   group: backend-${{ github.event.pull_request.number || github.ref }}
@@ -26,7 +14,55 @@ env:
   DEFAULT_UV_VERSION: "0.10.x"
   NLTK_DATA: "/usr/share/nltk_data"
 jobs:
+  changes:
+    name: Detect Backend Changes
+    runs-on: ubuntu-slim
+    outputs:
+      backend_changed: ${{ steps.force.outputs.run_all == 'true' || steps.filter.outputs.backend == 'true' }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6.0.2
+        with:
+          fetch-depth: 0
+      - name: Decide run mode
+        id: force
+        run: |
+          if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
+            echo "run_all=true" >> "$GITHUB_OUTPUT"
+          elif [[ "${{ github.event_name }}" == "push" && ( "${{ github.ref_name }}" == "main" || "${{ github.ref_name }}" == "dev" ) ]]; then
+            echo "run_all=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "run_all=false" >> "$GITHUB_OUTPUT"
+          fi
+      - name: Set diff range
+        id: range
+        if: steps.force.outputs.run_all != 'true'
+        run: |
+          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
+            echo "base=${{ github.event.pull_request.base.sha }}" >> "$GITHUB_OUTPUT"
+          elif [[ "${{ github.event.created }}" == "true" ]]; then
+            echo "base=origin/${{ github.event.repository.default_branch }}" >> "$GITHUB_OUTPUT"
+          else
+            echo "base=${{ github.event.before }}" >> "$GITHUB_OUTPUT"
+          fi
+          echo "ref=${{ github.sha }}" >> "$GITHUB_OUTPUT"
+      - name: Detect changes
+        id: filter
+        if: steps.force.outputs.run_all != 'true'
+        uses: dorny/paths-filter@v3.0.2
+        with:
+          base: ${{ steps.range.outputs.base }}
+          ref: ${{ steps.range.outputs.ref }}
+          filters: |
+            backend:
+              - 'src/**'
+              - 'pyproject.toml'
+              - 'uv.lock'
+              - 'docker/compose/docker-compose.ci-test.yml'
+              - '.github/workflows/ci-backend.yml'
   test:
+    needs: changes
+    if: needs.changes.outputs.backend_changed == 'true'
     name: "Python ${{ matrix.python-version }}"
     runs-on: ubuntu-24.04
     strategy:
@@ -100,6 +136,8 @@ jobs:
           docker compose --file docker/compose/docker-compose.ci-test.yml logs
           docker compose --file docker/compose/docker-compose.ci-test.yml down
   typing:
+    needs: changes
+    if: needs.changes.outputs.backend_changed == 'true'
     name: Check project typing
     runs-on: ubuntu-24.04
     env:
@@ -150,3 +188,27 @@ jobs:
             --show-error-codes \
             --warn-unused-configs \
             src/ | uv run mypy-baseline filter
+  gate:
+    name: Backend CI Gate
+    needs: [changes, test, typing]
+    if: always()
+    runs-on: ubuntu-slim
+    steps:
+      - name: Check gate
+        run: |
+          if [[ "${{ needs.changes.outputs.backend_changed }}" != "true" ]]; then
+            echo "No backend-relevant changes detected."
+            exit 0
+          fi
+
+          if [[ "${{ needs.test.result }}" != "success" ]]; then
+            echo "::error::Backend test job result: ${{ needs.test.result }}"
+            exit 1
+          fi
+
+          if [[ "${{ needs.typing.result }}" != "success" ]]; then
+            echo "::error::Backend typing job result: ${{ needs.typing.result }}"
+            exit 1
+          fi
+
+          echo "Backend checks passed."